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A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).
Tide tables, sometimes called tide charts, are used for tidal prediction and show the daily times and levels of high and low tides, usually for a particular location. [1] Tide heights at intermediate times (between high and low water) can be approximated by using the rule of twelfths or more accurately calculated by using a published tidal ...
The Official Southeast Asia Charts (shortened to the Official SEA Charts) are a collection of record charts launched in 2025 by the International Federation of the Phonographic Industry (IFPI). Based on data from BMAT , the charts reflect the 20 most- streamed songs in six Southeast Asian (SEA) countries: Indonesia , Malaysia , the Philippines ...
The Philippine Atmospheric, Geophysical and Astronomical Services Administration (Filipino: Pangasiwaan ng Pilipinas sa Serbisyong Atmosperiko, Heopisiko at Astronomiko, [4] abbreviated as PAGASA, which means "hope" as in the Tagalog word pag-asa) is the National Meteorological and Hydrological Services (NMHS) agency of the Philippines mandated to provide protection against natural calamities ...
The Philippines is considered the most exposed country in the world to tropical storms as approximately 20 cyclones enter the Philippine Area of Responsibility (PAR), the area of the ocean the ...
The Philippines' National Mapping and Resource Information Authority (Filipino: Pambansang Pangasiwaan sa Pagmamapa at Dulugang Kaalaman), abbreviated as NAMRIA, is an agency of the Philippine government under the Department of Environment and Natural Resources responsible for providing the public with mapmaking services and acting as the central mapping agency, depository, and distribution ...
Sabina Shoal is a disputed low-tide elevation [1] [2] in the Spratly Islands which is claimed by multiple states: China, the Philippines, Taiwan and Vietnam. As a low-tide elevation that is not within the territorial sea of a littoral state, Sabina Shoal itself does not generate any territorial sea of its own per Article 13 of the United ...
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